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Simplifying 21 = 6 + -3a + -3 Reorder the terms: 21 = 6 + -3 + -3a Combine like terms: 6 + -3 = 3 21 = 3 + -3a Solving 21 = 3 + -3a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '3a' to each side of the equation. 21 + 3a = 3 + -3a + 3a Combine like terms: -3a + 3a = 0 21 + 3a = 3 + 0 21 + 3a = 3 Add '-21' to each side of the equation. 21 + -21 + 3a = 3 + -21 Combine like terms: 21 + -21 = 0 0 + 3a = 3 + -21 3a = 3 + -21 Combine like terms: 3 + -21 = -18 3a = -18 Divide each side by '3'. a = -6 Simplifying a = -6
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